SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169510bc771611b94c8cf742a67ecc1d94b3f15c4535f89fab567ce5e5c28598' 
  AND token = 'GhPbv9adUFAJmufBLOZRyHsnZQG8jt9UsV55quZWBAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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