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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bc590613f51372faab0bdc3091854966bf887db5c208b76c70698a67f5696a' 
  AND token = 'UM1oxbaIppKnBDrdBRsVOwexZ6u70AYYw4levCFRa+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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