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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50371c4b695d762cef55d70c92e63ba8f042c1b4f33b058b3fbc98d25ec72708' 
  AND token = 'xICGe6fGpiqTaDqQhhK/7J5vv4N0J9mTpxVE48ewGpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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