Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5af200ba95b4818592af349dba0399334f665e89c9cccc3b517bff091822f9' 
  AND token = '9MHnqV5G82pcshsAvgt3VQuRLZ/GFMmAhH9bUYApl2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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