Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd280f7915e9f53cdd1cf6e81d17d725de7e8d8dc8239d93de075c11653cb0599' 
  AND token = '4xLCRH8gVyNThXpayvdJ+yPh8WYCtfwMYHfk0xvOXgc=' 
  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"
    }
  }
}