Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec7625c6c1cabcff13c03659fec792f9030705c08c7ce53bd5b3b691b69a477' 
  AND token = 'AbT1uVByCmEIeDcA0DApeAh6CGgOSRYjXaSrL/fABdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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