Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef10cea4fcfea9b9cba6b13d4053210c0112522349d4e09207964f064bc9fffa' 
  AND token = 'JQvuL/Glz5VOY9lo9aeFcpx0Cy9MYkxjcukamtoG2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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