SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bba3f21dc9f37a272fa069548f072116554b5faf9b63060a789a9548b12194' 
  AND token = 'V2r7MyJjP5HrfuK4bz9pq7zkEtLv3c89Zp/N4lcqjYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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