Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b680ab7960543f16b5a6943b1e73ca66d6efeaf27461b35d54b020efd78d2c22' 
  AND token = '152tcS8XBMAQEfUfFW3Ew9u1oQuDzJHbYvBQEJ2Gk2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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