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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a11e90719e33715416f1b139ac87c171cfc522ccb7b9a5eb0ce9a4bc168068d' 
  AND token = 'efpy1yz0/4Chexa+7OAPWp9QGopr6drHxYgwd6Ha+7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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