Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c46a0d166bd696b7f26d803bb278fe31f8d38bef72bbc1d622d74a532724e6' 
  AND token = '3SNJJlM0xEPjlrmelZnDD/8FyIhQ2Rf0skT9f51xicM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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