Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c99e44aca2ac4aa454e1317938d31ead79cc10d8b6d6ddaa98f81e760ab10b7' 
  AND token = 'OtQinLv5IWMfM2B6djeslilQUSnirMrtoLb3Fot51ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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