Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f647f5bd70d9716af3cceaadaf6d07ee0adfaeb86702b4509ade8a2f6efbe9b6' 
  AND token = 'terjb73+4yZF6YPmSuahwsiu5kMpbERQDPOWGeXsfzU=' 
  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"
    }
  }
}