Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186d56f1c146da92ebb1982fd20efd98f68ee2cb99519cefe1b6fe515d49869a' 
  AND token = 'Y0dXEfBLbSUQpyXlp8w9i0b6VFeZEZftJOt8H04eOIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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