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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02371ec30fed3fb7a716e1a08d4b0e03c826eda99cf4a114951a3cc20adac810' 
  AND token = '/7bjYLi690xKSehMRqQTOzjTAXoc5snGzz8DcBkA/gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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