Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d3c3538179dbcef9cf7e68e11f454cd69509ec945367c60adbe3d1d4668d3e' 
  AND token = 'yXNszwrCCmmNQ1uCmdixYARAteliCYTECJ29oL35zl8=' 
  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"
    }
  }
}