Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723c9ce533ef2fb99b0437cd752dff29223e420e74e3cf27b491a284c5c216c2' 
  AND token = 'k3jHSGdFNH1md09FdLB3jKgpKQhtE690m3xoA3dzEME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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