Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795d1b6d63307e15f84469f1fa48da98c64b4ac2fbd89fd6c59d4a812becdffb' 
  AND token = '3uRTn1pucYO3v5NoQMK/4evsyPph0dDOmb3uZfYYRfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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