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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66744b29c15a5172c7f5a6f45246a6a4af831683d10d9acd485a6b156201d67e' 
  AND token = 'qEGfS4bRgnqtpQ4uKqSIOO5dnj7O5uyTHZz3S+bVIr8=' 
  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"
    }
  }
}