Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b327bb5729eb0e89dd1348c5ff41c4ed25145fce07a0441d821a352de56608' 
  AND token = 'k7ak958zorntXmqvMSSROJvK1eDI6Ik5alHrug0KAT0=' 
  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"
    }
  }
}