SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33004f831f1509e656db43eaf1761bf685ce15e069e70e15ff2255b54f65850d' 
  AND token = 'qJFxhQUHVyG5TGRcn1vBZDhmSTE8Hh+QwD9HjFx/x3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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