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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c47ca5bceb70ac3f4057c6ae17d219ca190cf95b04da968d7717302a0da6d7f' 
  AND token = 'TiOVCXxuWApnrJ5xkg1x3OG1uXNnaLFxMuQJy1dy6NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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