Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5201b15e8e9e93edd35dc1459754543b776c53bb804fc564357f3fa4202c903f' 
  AND token = '6MxLNrRvp1MxKBtPhrBww3hulS365jS1dUzW/eMWcDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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