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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19fd9e56002c751b26b48c86e9d48ff1ac42c4c7777f3c8b03340a40fc2d38f' 
  AND token = 'GOHUptIgjoQSAG5c4seMVaTm7Kt8CIS3eEuGvX4mmnU=' 
  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"
    }
  }
}