Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b891a3f1ae250860ca0ddd59101687b523979def02bcd4f3fb2c1fcf7991f174' 
  AND token = 'QQy4w4e+vJwZKCryOp4XlSvD+al/OR6e+y44ItxY170=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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