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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8737bdd92d043330e4d2b2e7d32a27db6c2c2a69d5046d480820841ea053d3' 
  AND token = 'ugZs4nJL9us68dmgCJEaxPD6Z4i+SST+sAUjWhuwBgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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