SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56b9a74dec8d0348c6116b95d6eb0ca01c1ae2a38d3a12efd39ffe708571c77' 
  AND token = 'dZHTShz8/bjzgXlZwWQyNxvZfGg4sVVw8Nt0K6BWLgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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