Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3837b16072227c270bb7ba20500f4299a6b1e7c2620875d5bdbb3896902529' 
  AND token = 'vr1PyPZHH5zD+NXOTNL9VDQYgz5YZ+YlrQwaNoIbyhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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