Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9da35e7dd04b3073c0e04543d5a93b432709e24b4014a5a6d7599eb66220ce3' 
  AND token = 'WHjzq6xLNRfe2GNm+Lbq5HNdk8J8hoQsuhE9jVkpHMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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