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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79916113ab82987a6f1c861a0d45c7423d938c637af1b0b9ed618a7690baf380' 
  AND token = 'N7/QS6814KWfBMPsKRAfwEownoENTzORnmrL5hvIan4=' 
  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"
    }
  }
}