Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a509f81a462fb1494756811e425e0e351598eb5cb0d488323e89603b176322d' 
  AND token = 'vuTPhmjKNm3rRcVize4aYjM3CJ7Cby/1RTlNEEhucxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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