Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177b11e8e12dbf3f8976191c3193b87977d2c9bef78b00da7694e35c25ef612c' 
  AND token = 'y3HGriD/XHP2uu0CRvA+EpYzMrCOGS9US5WwmTe+cV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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