SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011442f5a5473e1ecd31c936297a904ff0b06086d06693902d9d5b00921c9e60' 
  AND token = '9SgGrFr/OJLK1lShCTB+3NHB/OT+R+zhVKiy4PVwRqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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