Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de327ac38979bf5a931a827269a21fb25504c4b1dab156b35547ee64a8ebae48' 
  AND token = 'uWAeDgBgzIjquDoujkv+adezetlUWIvvyj0jmg2gSLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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