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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f62c7e5896bda1dc0e7b089fbb065e99660bf641060771b9f6e4a2fe81c709' 
  AND token = 'sY7pwSR8TttB//OR+WwwNBUBnE7s7UG3Cugl86FxsN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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