Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f16623ac21ed65644bc5024ea31381191e1706f17bfb842d6b5639814035b9' 
  AND token = 'PfhGT19i1G0g0CbsvPN+10bJFF4dmqzfYw5h0zSyDCY=' 
  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"
    }
  }
}