SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1147684f550c8c5e7b06209ef92d72eb10d23643a897c91f3353057f8cc105b8' 
  AND token = 'VQcyo/ldLeJwek3qJBjHhiSw4kDYla+9Fbm0hWZvBVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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