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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d7b4072ab82a1b19ef2560fd926de1675932ddf1958ab022edcbe735f636f6' 
  AND token = '/N7h4w3hjkf3r6ZOAtOCk0HNgeTfVfyZy3f/nn70Xcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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