Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503eae48e16e3892477c5ffebaece756b387b4b91afe6deed099181acea56285' 
  AND token = 'vBTv3w+ehrVLS98iDiomv2ooyI2N4F/TlAN2KKhI1G0=' 
  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"
    }
  }
}