Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e42943dfebdd5abda31d16e2fc8e45a884555366f632bb9147fa7eba1e44884' 
  AND token = '9/SeqXkW3cUYo2L7HiJkfvxR/MgEAtxtbJLWs3RQb1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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