SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c24891c8185d0e0a7a24cb875a53872ca6ff650f903a26cb04b16848f91fce2' 
  AND token = 'Y+ggFXqDzhVLo+zGfu9oWJsozNdc0WVBUtS6m6Hr0/E=' 
  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"
    }
  }
}