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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6804dae3a403a3d1e58214aeace563d7bf1bb07b04b720f0b291d980a1db9884' 
  AND token = 'e3fqFHBAP2UW4w1XFCgd3PY3gGYEqSGCoOS9G8P3h/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}