Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc1e4598ef7374c0016fb7aeabeb0b5e86ca51fa294d382b3362ef64b57b294' 
  AND token = 'nqe35NYjvRt7uFkz1xu1tPa7L5PNxI7R6/0DNUxDcDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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