Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617609e054d8c145e6cd199a1da719e1c31bbb61271876017f6bfac03c166a38' 
  AND token = 'A8os/S+Qea3NlZKdP6v3FSkImhmrwVjbF+jnlQqe/UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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