SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdda6934fd43062d3828f0491a52ee11a9aeafd535aff0c9502fa2dac675cb1c' 
  AND token = 'xkruACFO3VPUfxWT+tBVI7qqLZ/og8sX6PlAvDdoHiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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