Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd620b8eb4f01b0f5398bf7283ac137c6654f5af53478f4c0337bfc73a884ac91' 
  AND token = 'BZlQ9b9fKpOEOlN4+ufEBx/eE1IcRrdWnn1JdnysGE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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