Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48a2e0c296de8b880d979206924613c1806c2ff385ce3327a778bdf42fa8045' 
  AND token = 'mEQ6c7EtFKFtbyuxc7bYNseTDq/ScHDTgW6WdPhYVf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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