Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecc790510afa25f7094b29a9a780b6bc3e7a18085f538dd9a97a5b44c5e518b' 
  AND token = '0NF4kmhL+kPeCTghnH2UCmlZH0pjwtpGyChwF2alCSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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