Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc8f060312cc788ffc8d3a0a3bef011471e5178de3f170d620089642427e5e5' 
  AND token = 'Y2TQrBMZ7dq9NgtMHlGwIDqlDTF8UaS3D04P1tqT5iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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