Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609b2d71055337eb1cda15607b5593cd004735e10fc217bc77208a494237404b' 
  AND token = 'cfT8rMsA2MuZc3Hn4GcrCEhjXpIhd/8aL2V/nS0OXSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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