Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0da0403b146a99c26a08ca8e87298fce1c36668c15fac87c26515ab451d538' 
  AND token = 'Pc4qsVxj+2d79b3NIO0u8w5e+3EYSo6OTTDGdhn4NxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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