Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5945a874254494dbfa112d43010180bd2d3346cad4ddcf5f779bce7e0689a45a' 
  AND token = 'kyvqK+5fRXj6a0JaSzbkjc1TrvVbB2BEKBo2TQD2d5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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