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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3792c5e2288ac7fd687b3bbb57f940adfca270ecfd836e5a9742855de46684de' 
  AND token = 'vrPxzDA8QVZXXq0ydFMb2Xh8u9YIQGYMP0Luw4sUGe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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