SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5319c6195d52e776e1b65b90743a1dbdc925d2c25498931c7cfe0234989a8604' 
  AND token = 'XEu7EmkhwiQ7GbvZGwKVJcd0KgV6hAqIraHoLT6fWvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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