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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608b966fe46c084b8a4e84b08b3a3532f237b1bd6745fe4cf571982a672b499d' 
  AND token = 'Xn41jtAgTyeM9cntCnA6O8dZ7RSGHJM22ym6I/vLt8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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