Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa1f3ee88eb3fb0e8c17a7d2c8e409e6494258d3a553f7574c3a5d2aaf5bc8d' 
  AND token = 'dxxNAYWVi6qyky+F9jJ4uuvfYbW0WGVHC9I0JiSELc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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