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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b47ab3f52334ed36d5302f3685997c0532974c9975e43c61924b59037c4a5f' 
  AND token = 'GZrwtGtiWRCt48d4lFLWoAiHACWOi5OKrMx5nWUkcj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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